66574881 has 12 divisors (see below), whose sum is σ = 97323408. Its totient is φ = 43848024.

The previous prime is 66574861. The next prime is 66574897. The reversal of 66574881 is 18847566.

It is a happy number.

It is not a de Polignac number, because 66574881 - 2⁶ = 66574817 is a prime.

It is a super-2 number, since 2×66574881² = 8864429560328322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66574831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43815 + ... + 45308.

It is an arithmetic number, because the mean of its divisors is an integer number (8110284).

Almost surely, 2^66574881 is an apocalyptic number.

It is an amenable number.

66574881 is a deficient number, since it is larger than the sum of its proper divisors (30748527).

66574881 is a wasteful number, since it uses less digits than its factorization.

66574881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89212 (or 89209 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 66574881 is about 8159.3431720942. The cubic root of 66574881 is about 405.2939612509.

The spelling of 66574881 in words is "sixty-six million, five hundred seventy-four thousand, eight hundred eighty-one".